Mold-cutting machine



June 19, 1928.

J. H. NESBITT MOLD CUTTING MACHINE Filed July 16, 1926 4 Sheets-Sheet lJune 19, 1928.

J. H. NESBITT MOLD CUTTING MACHINE Filed July 16, 1926 $Sheets-$heet 2dllllLlllllnur L l l 1 I llllillllll! attonmg Jfine 19, 1 928.

J. H. NESBITT MOLD CUTTING MACHINE Filed July 16, 1926 4 Sheets-Sheet 352 If F474 314110! 1 foz June 19, 1928.

1,673,987 J. H. NESBITT MOLD CUTTING MACHINE Filed uly 16, 1926 4Sheets-Sheet 4 Patented June 19, 1928.

UNITED STAT-ES 1,673,987 PAT E NT OFFifC E JAMES H. NESBIT'I; F AKRON,GHIO, ASSIGNOR .TO .THE (AKRON RUBBERMOLD AND MACHINE COMPANY, Cl]?AKRON, OH'IO,1A CORPORATION OF OHIO.

MOLD-dfi'iTING memes.

application filed Jul 16,1926. Serial No. 122,865.

This invention relates to new and novel improvements in machines formanufacturing articles having transversely arcuate cavities andparticularly to machlnesior cutting, machining or otherwiseworlring-ont-he walls oi an annular or arcnate cavity of curved orarcuatc cross section.

While the invention 'is adapted fonuse generally wherever it maybeapplied, it-is particularly intended for use in cnttmg depressions ofa desired configuration in the walls of the cavities of rubber tiremolds.

The invention will be herein illustrated and described as applied to amachine for cutting a tread design in molds for nianufacturing rubbertires. w

In the manufacture of rubber tires, 1t is desirable to provide a roadengaging surface oi? a particular design. This road engaging surface,commonly known as a non-'slricl tread, extends circumferentially of thetire and is usually in the form of a small pattern continuously joinedor successively repeated to form a peripheral and lateraisurface ofuniform design extendingentirely around the tire.

In machines for cutting this design in the rubber tire molds, a profilepattern or jig is ordinarily employed to limitlthe arcua'te movement ofthe tool and the rotary movement of the work to direct and control theoperation of the tool within the limits of the selected design.

The main object of this invention is to provide a machine in which adepressed proiile jig may be used which is considerably larger than thedesign to be cut in the mold whereby slight variations orjinaccuraci'esin the pattern will not be noticeable in the finished product.

A further object isto provide a machine oi? the character above setforth in which the depressed profile in the jig may be in anyproportional size to the finished deslgn and which will exactly conformto the shape and contour of the design to be formed in the product andto thereby provide means whereby the pattern or jig can be more quickly,conveniently and accurately "formed.

A still further object is to provide a machine in which difl'erentcombinations of gears may be selectively employed to obtain from asingle jig a cut of the same shape and contour in any proportional sizeand to thereby provide means whereby a single jig may be employed toproduce the same pattern in different sizes.

An additional object is to provide a inachine of the class aboveindicated which will beoi' simple, durable construction and which willbe rapid and (accurate in operation and which may be easily andconveniently operated.

-The above objects are accomplished and additional ends are attained bythe novel construction, combination and arrangement of parts hereinafterdescribed and illustrated in the accompanying drawing wherein is natelike parts as the saine'may appear in any of theseveral views and inwhich:

Figure l is a side elevational View of a machine constructed inaccord-mice with this invention showin-gthe same with a tire moldoperatively mounted thereon, the same be ing partly broken away andshown in cross section to more clearly illustrate the invention.

Figure is a side elevational view of the upper portion of themachine.

Figure 3 is a cross sectional View taken asindicatcd by the "lines '3-3of Figure 2.

Figure is a cross sectional view taken as indicated by the lines -l4rofFigure 4.

Figure 5 is a side 'elevationalview' showing a modified term of theinvention. v

Figure 61s a cross sectional view of'same taken asindicated by the line66 of Figure 5.

Figure-7 is a cross sectional viewta'ken indicated by the line of Figure4.

The invention will now be described with reference to the particularadaptation there of disclosed in the drawings in which the numeral 10 isused to denote a suitable supporting structure. The supporting structure10 is provided on the upper face thereof with longitudinally directedside ribs ll on which is slidably mounted a Work supporting member 12.The numeral 13 denotes a work holder which is rotatably mounted on thework support 12. The work holder 13 is provided with a downwardlypresented annular gear face 14.

The numeral 15 denotes a standard which is suitably secured to one endof the supporting structure 10. The standard is pro vided with asuitable head 16 which is secured to one side thereof so as to projectover one side of the work support 1;). The head 16 is provided at theforward end thereof with a vertically disposed bracket 17 and at therearward end thereof with a parallel bracket 18. The numeral 19 denotesa cylindrical pattern member which extends longitudinally between thebrackets 17 and 1S and is pivotally mounted therebetween by means of thescrew bolts 20. The cylindrical pattern member 19 is provided at therear end thereof with a pinion 21, arranged to mesh with an intermediategear The intermediate gear is mounted on a stub shaft 23 which issuitably secured by a bracket 2-]: to the standard 15. The numeral 25denotes a shaft having .its forward end rotatably mounted in the bracket:26, on the work support 12 and the rear end thereof mounted in thebracket The shaft is provided on the forward end thereof with a beveledpinion 27. The pinion 27 is in mesh with the gear face 14: whereby arotation of the shaft 25 will cause a rotation of the work holder 12.The shaft 25 is provided at a point adjacent the rear end thereof with agear wheel 28 which is in mesh with the intermediate wheel The numeral29 denotes a hand wheel which is fixedly secured to the rearwardlyprojecting end of the shaft The bracket 17 is provided on the upper facethereof with a horizontal guide ay 30 on which is slidably mounted amember 31. The member 31 is provided with a portion which projectsrearwardly at a point above the cylindrical pattern member 19. Theportion 32 is provided at the rear end thereof with an upstandingcylindrical portion 33 in which is mounted a vertical pin 3-1.

The numeral 35 denotes a prolile pattern which is cut in the form of agroove or depression on the cylindrical member 19. The pin 34: isadapted to be entered 1n the dcpressed pattern or profile The numeral 36denotes a rack which is adjustably se cured to the member 31 by means ofthe bolts 37 or other suitable fastening means. The rack 36 extendsrearwardly and is supported at its rear end thereof with a roller 38which is mounted on a suitable bracket 39.

The numeral 40 denotes a gear wheel which is detachably fixed on a hub41 of a second gear 12. The said gears are rotatablv mounted on a bolt43 which is secured in the block 44. The block 44 is adjustably securedto the head 16 by means of the screw 45; the screw s5 being provided atthe upper end thereof with a squared portion -16 which may be engaged toraise or lower the block ll relative to said head. The gear wheel -lt)is in mesh with the rack Iltj whereby a longitudinal movement of saidrack will cause a rotary movement of said wheel.

The numeral :l'i' denotes a. second rack which is suitably mounted forlongitudinal movement on the rollers lo and -13). The rack mcnibcr 1T isprovided on the rearward portion thereof with upwardly presented teethwhich are in mesh with the gear wheel T2. The central portion of therack member to is inclined downwardly, and the forward portion thereofprovided with a downwardly presented rack face -17".

The head 10 is provided on the forward end thereof vith a downwardlyprojecting, parallelly spaced brackets 5t) and 51. The spindle head isrotatably mounted between said brackets by means of the shafts 515, formovement on a horizontal axis. The. numeral 571i denotes a sector gearwhich is mounted on the shaft 5-) and is rigidly cured to the spindlehead iii. The sector gear is in mesh with the rack tare l7 whereby alongitudinal movement of the rack '17 will cause a rotary movement ofthe spindle 52 on the shaft 5.). The spindle head is provided with abore 55 which extends therethrough at a right angle to the shalt 52). A.suitable spindle fit) is mounted in said bore. The mnncral iii denotes adrive pulley which is secured to the outwardly projecting end of saidspindle and the numeral 5S denotes a tool which is s curtnl to thedownwardly projecting end thereol'. The numeral 59 denotes a section or"a tire mold as it is positioned in the work holder I). A suitable handletilt is secured to the member All whereby the. member may be moved onthe guide 30 to swing the tool spindle in an arcuate path. lt will henoted that the handle wheel 25) may be op rated to revolve the mold 5.)within certain liiuils: the. revoluble movemcnl being limited by the pinIll, entered in the depres gion pattern in the rotatable pattern memberlfl. lt will also be noted that the tool it; may be moved in an arcuatepath to cut the walls of the mold 59 and that itsv arcuate movement islikewise limited by means of the said pin Tn the modification of theinvention shown in T igures 5. t3 and T. the head it; is 'novided withlongitudinally dispowd side ribs (30 in which is slidahly mounted astylus carrying member tll. The rib: on are disposed longitudinally ofthe cylindrical member 19 and the member (d i mount ed thereon so as tobe moveablc longitudinally thereof. The member ("d is provided with astylus arm (32 having a verti al bore 63 in which mounted a stylus: til.The

aerate:

arm .62 projects above the pattern member 19 whereby the stylus 64 canbe entered in the pattern 35 thereby providing means whereby thelongitudinal movement of the member 61 will be-lim'ited by theloi'igitudinal extent of the pattern 35.

The numeral 65 denotes a rack which is secured to the member 61. so a toproject liorizoi'itally therefrom with the teeth oi the rack presentedon the upper side thereof. While the rack 65inay be secured to themember 61 in any suitable manner, 1. prefer to secure the same in themanner shown in the drawing wherein the rack is provided adjacent therear end thereof with two vertical slots 66 which are spaced in parallelrelation to each other. The numeral 67 is used to denote bolts which areentered through said slots operatively positioned in suitable bores inthe member 61 whereby the bolts 67 may be operated to hold the rack 65in position in the member 61. An arm 68 is pivotally secured to the head16 at a. point below the rack 65, with the free end thereof positionedbeneath the rack 65 and arranged to swing in a vertical plane to saidrack. The arn1'68 is provided at the free end thereof with a suitableroller 70 which is arranged to contact with the lower face of the rack65 whereby the free end of said rack is supported by said roller. Thearm 68 is provided with a downwardly projecting portion 69. The unmeral71 denotes a stud which is'secured to said frame 16 at a point below thearm 68. The stud is provided with a threaded bore in which is mounted ascrew bolt 72 which may be operated to bear against the downwardprojecting portion 69 to raise or lower the roller 7 O. The head 16 isprovided with a vertically alined row of bores 73 which may beselectively employed to mount the arm 68 and the stud 7 3. It will thusbe seen that the horizontal rack 65 may be adjusted vertically of themember 61.

The head 16 is provided at the forward end thereof with a vertical slide7 4 on which is mounted a block 75. The block 75 is provided with abearing 76 in which is rotatably mounted a shaft 77. The numeral 78 denotes a screw bolt which is threaded in a vertical bore in the block 79which is positioned directly above the slide way 74. The lower end 01the bolt 78 is rotatably secured to the carriage 75 whereby the bolt 7 8may be operated to raise or lower said block 7 5.

The numeral 80 denotes bolts which are positioned through suitable boresin the block 75 and are entered through a vertical slot 81 in theslide-way 7 4 whereby thebolts 80 may be operated to set the block 75 ina fixed position. The horizontal shaft 77 is thus disposed in parallelrelation to the shaft 53. The shaft 77 is provided on one end thereofwith a gear wlieel82 which is detachably secured thereto and which ismeshed with theteet-h on the rack 65. The other end or the shaft 77 isprovided with a gear wheel 83 which is in mesh with the sector gear 54.It will thus be seen that a movement oi the spindle 52 on the pin53will'belimited by the'stylus 64 to the longitudinal extent of thepattern A plurality of sets of gears 82 and 83 are provided whereby'thegears oi difi'erent ratios may be employed so that the movement of thetool 58 may be changed relative to the pattern As the rack is adjustableon the member 6i and the block 75 is adjustable on the head 16, anydesired size of gear may be used on'either end of the shaft 77 wherebythe same pattern 35 may be employed to cut the design oi the pattern inthe molds of di t l erent sizes.

It will thus be seen that the tool 58 can only be operated within anarea limited by the depressedpattern35. In changing from one mold toanother, or in changing patterns, the gears ll and it), may be changedfor gears of other sizes and proportions. In this way any gear ratio maybe obtained by adjusting the rack on the bolts and by operating thescrews lf) to bring the gear 42 into operative engagement with the rack47. i

It will benotedthat the depressed pattern may be exactly the same sizeas the cut to be made in the mold or it can be made larger or smallerand that the several dimensionsol the pattern will be proportionatelythe same regardless of its relative size. It will also be noted that thesame pa tern can be used to make cuts of different sizesthe only changethat is necessary being to change the-gears and it) and substitute gearsof a difi'erent ratio.

While I have shown and described my in-' vei'ition as embodied in amachine for cutting tire molds, it is to be understood that it may beadapted for other purposes and may be used wherever it may be applied.

Having thusillust-i'ated my invention and described thesame in detail,what I claim as new and desire to secure by Letters Patent is 1. In adevice of the class described. a frame work support rotatably mountedthereon. a tool holding means rotatably mounted on said frame formovement in a plane extending transversely to the plane of the worksupport, a tool rotatably mounted on said tool holding means, the axisof said tool intersecting the axis of the holding means. a gear fixed tosaid tool holding means, a rack meshed with said gear; a

cylindrical member rotatably mounted on said. frame, a depressed patternon said member. gears operatively connecting said 'member with said worksupport, a stylus holding member slidably mounted on said frame, astylus mounted thereon and adapted to be entered in the depressedpattern, a rack on said stylus holding member and means to operativelyconnect said racks, said means comprising coaxially connected gears,means to simultaneously rotate said cylindrical member and said worksupport and means to move said stylus holding member.

:5. In a device 01 the class described, a frame, a work supportrotatably mounted thereon. tool holding means rotatably mounted on saidframe for movementin a plane extending transversely to the plane of thework support, a tool rotatably mounted in said tool holding means, theaxis of said tool intersecting the axis of the tool holding means; agear lixed to said tool support, a rack n'ieshed with said gear, acylindrical member rotatably mounted on said frame, said member havinga. depressed pattern, common driving means operatively connecting saidmember with said work support, a stylus mounted thereon and adapted tobe entered in the depressed pattern, a rack on said stylus holder, aplurality oi. pairs of interlocking gears of dillerent ratios arrangedto be selectively employed to operatively connect said racks, and meansto move said stylus holding member. I

3. in a device of the class described, a rotatable work support, tool.supporting means rotatably mounted for movement in a plane extendingtransversely to the plane of the work support, a tool spindle rotatablymounted in said tool support, the axis of said spindle intersecting theaxis of the tool support; a gear fixed to said tool support, a rackmeshed with said gear, a rotatable pattern member having a depressedpattern thereon, gears operatively connecting said member with said worksupport, a stylus holding member mounted for movement longitudinally ofsaid rotatable pattern member, a stylus mounted therein and adapted tobe entered in said pattern, a rack on said stylus holding member andmeans to operatively connect; said racks, said means comprising aplurality of pairs of coaxially connected gears of ditlerent ratios,common driving means for said cylindrical member and said work supportand means to move said stylus holding member.

l. In a device of the class described, a l'rame, a work supportrotatably mounted thereon. tool supporting means rotatably mounted onsaid frame for movement on an axis disposed at a right angle to the axisof the work support, a tool spindle rotatably mounted in said toolsupporting means, a sector gear on said tool supporting means, a rackmeshed with said gear, a cylindrical member rotatably mounted on saidframe, a depressed pattern carried by said member, a stylus holderslidably mounted on said frame, a rack on said stylus member, a gearmeshed with the last named ra k, a second gear coaxially securedthereto, said second gear meshed with the first named rack and gearsoperatively connecting said cylindrical member with said work support.

5. in a device oi the class described, a :t'rame, a work supportrotatabty mounted thereon, tool supporting means rotatably mounted onsaid tramc [or movement on an axis disposed at a right angle to the axisof the work support, a tool rotatably mounted in said tool supportingmeans, a sector gear on said tool supporting means, a rack meshed withsaid gear. a cylindrical member rotatably mounted on said frame, adepressed pattern carried by said member, a stylus holder slidablymounted on said frame for movement longitudinally of said cylindricalmember, a rack on said stylus holder, a gear meshed with the last namedrack, a second gear coaxially secured thereto, said second gear meshedwith the lirst named rack, gears operatively connecting said cylindricalmember with said work support, and means to drive said gears.

6. In a device 01 the class described, a rotatable work support, arotatably mounted tool spindle, a spindle holder pivotally mounted formovement in a plane disposed transversely to the plane of the worksupport, a sector gear on said spindle holder, a rack meshed with saidgear, a. cylindrical member rotatably mounted for movement on an axisdisposed at; a right angle to the axis of said gear, said member adaptedto carry a depressed pattern, a stylus holder slidably mounted formovement longitudinally of said cylindrical member, a rack on saidstylus holder, :1 gear support adjustably mounted for movement to andfrom said racks, a pair of coaxially arranged gears detachably mountedon said gear support. means connecting said gears, one of said gearsmeshed with the first named rack, the other gear meshed with the otherrack aml common driving means connecting said cylindrical member withsaid work support.

7. In a device of the class described. a rotatable work support, aspindle holder mounted for moven'lent in a plane disposed transverselyto the plane of the \vork support, a tool spindle rotatably mounted onsaid spindle holder. a sector gear mounted on said spindle holder. :1rotatably mounted cylindrical member, a depressed pattern carriedthereby. a stylus holder mounted for movement longitudinally of saidcylindrical member, a stylus carried by said stylus holder, said stylusadapted to he entered in said pattern to limit the rotary movement: ofsaid pattern, means operatively connect ing said pattern with said worksupport whereby the rotary movement of the work support is limited bythe movement of said loo ltlfi llt] lilt) pattern and means operativelyconnecting said sector gear to said stylus holder Whereby the pivotalmovement of said spindle is limited by the longitudinal extent of saidpattern; said means including a rack and a plurality of gears adapted tobe selectively employed in pairs to regulate the extent of movement ofthe tool spindle relative to the longitudinal extent of said pattern.

8. In a device of the class described, a rotatably mounted tool spindle,a spindle holder pivotally mounted for movement on an axis extendingtransversely to the axis of the tool spindle, a gear secured on saidtool spindle a rotatably mounted cylindrical pattern member, a depressedpattern carried by said member, a stylus holder slidably mounted formovement longitudinally of said cylindrical member, a stylus carried bysaid holder, said stylus arranged to be seated in the depression in saidpattern and means operatively connecting said gear to said stylus holderwhereby the pivotal movement of the spindle holder is limited to thelongitudinal extent of said pattern; said means including a rack and aplurality of gears adapted to be selectively employed in pairs toregulate the extent of movement of the tool spindle relative to thelongitudinal extent of said pattern.

In testimony whereof I have hereunto set my hand.

JAMES H. NESBITT.

